For the purposes of Sections 1256, 1256.1, 1256.2, 1256.4, and 1256.5, “most recent work” is that work in which a claimant last performed compensated services:
(a) Prior to and nearest the date of filing a valid new, reopened, or additional claim for unemployment compensation benefits, a valid primary, reopened, or additional claim for extended duration benefits, or a valid application, or reopened or additional claim for federal-state extended benefits.
(b) During the calendar week for which a continued claim is filed.